diff --git a/include/libwebsockets/lws-logs.h b/include/libwebsockets/lws-logs.h
index 512d6fa2c..9097caf3b 100644
--- a/include/libwebsockets/lws-logs.h
+++ b/include/libwebsockets/lws-logs.h
@@ -82,6 +82,11 @@ typedef struct lws_log_cx {
 		lws_log_emit_t		emit; /* legacy emit function */
 		lws_log_emit_cx_t	emit_cx; /* LLLF_LOG_CONTEXT_AWARE */
 	} u;
+
+#if LWS_MAX_SMP > 1
+	pthread_mutex_t			refcount_lock;
+#endif
+
 	lws_log_use_cx_t		refcount_cb;
 	/**< NULL, or a function called after each change to .refcount below,
 	 * this enables implementing side-effects like opening and closing
@@ -99,6 +104,9 @@ typedef struct lws_log_cx {
 	/**< mask of log levels we want to emit in this context */
 	int32_t				refcount;
 	/**< refcount of objects bound to this log context */
+#if LWS_MAX_SMP > 1
+	char				inited;
+#endif
 } lws_log_cx_t;
 
 /**
diff --git a/lib/core/logs.c b/lib/core/logs.c
index 20b3c772f..14d6d617b 100644
--- a/lib/core/logs.c
+++ b/lib/core/logs.c
@@ -506,9 +506,24 @@ int lwsl_visible_cx(lws_log_cx_t *cx, int level)
 void
 lwsl_refcount_cx(lws_log_cx_t *cx, int _new)
 {
+#if LWS_MAX_SMP > 1
+	volatile lws_log_cx_t *vcx = (volatile lws_log_cx_t *)cx;
+#endif
+
 	if (!cx)
 		return;
 
+#if LWS_MAX_SMP > 1
+	if (!vcx->inited) {
+		vcx->inited = 1;
+		lws_pthread_mutex_init(&cx->refcount_lock);
+		vcx->inited = 2;
+	}
+	while (vcx->inited != 2)
+		;
+	lws_pthread_mutex_lock(&cx->refcount_lock);
+#endif
+
 	if (_new > 0)
 		cx->refcount++;
 	else {
@@ -518,6 +533,10 @@ lwsl_refcount_cx(lws_log_cx_t *cx, int _new)
 
 	if (cx->refcount_cb)
 		cx->refcount_cb(cx, _new);
+
+#if LWS_MAX_SMP > 1
+	lws_pthread_mutex_unlock(&cx->refcount_lock);
+#endif
 }
 
 void